The tax plan put forward by the Republican-led House of Representatives would eliminate many current deductions, and getting rid of one of them in particular could deal a serious financial blow to seniors and individuals with disabilities. The plan proposes eliminating the medical expense deduction, a change that will especially affect those needing long-term care.

Currently, taxpayers can deduct certain medical expenses from their income taxes if the expenses add up to more than 10 percent of adjusted gross income. These expenses can include health insurance premiums, deductibles, nursing home fees, home health care costs and even assisted living fees, if a doctor certifies that the individual must live in the facility due to health care or cognitive needs.

While most taxpayers don't have health care expenditures exceeding 10 percent of their income, many seniors and others with disabilities do. According to the IRS, 8.8 million households — almost 6 percent of tax filers — claimed medical deductions in 2015. The AARP estimates that 74 percent of those who take the deduction are age 50 or over and half have incomes of $50,000 or less.

“It tends to be mostly … older people who do not have long-term care insurance, and end up in a nursing home,” said Richard Kaplan, a professor who specializes in tax policy and elder law at the University of Illinois College of Law, told CNBC. “For people who are receiving long-term care and are paying for it themselves, this is going to be a huge deal.”

For them, having the deduction can mean that they do not run out of funds and have to rely on Medicaid, or are at least able to postpone applying for Medicaid. Eliminating the medical expense deduction will likely mean that more people will spend down their assets more quickly, requiring them to apply for Medicaid. In addition, adult children who pay for their parents' care can sometimes use the deduction. For more information about how this may affect you, click here.

In addition to eliminating the medical expense deduction, the tax bill cuts to corporate tax rates. The bill’s proponents argue that the tax changes will unleash huge economic growth that will result in higher tax revenue. However, if the bill’s supporters are wrong and the growth in tax revenues is not as large as proponents predict, the reduction in tax revenues likely cause sharp cuts in government spending or an increase in budget deficits, or both. A reduction in spending could affect seniors and individuals with disabilities through cuts to Medicaid, Medicare, Section 8, Meals on Wheels, and food stamps.

The tax proposal would benefit a small number of wealthy seniors by eliminating the estate tax. Under the proposal, the estate tax exemption will be increased from $5.45 million to $10 million for individuals dying in 2018 through 2023. After 2023, the estate tax will be eliminated completely. The Tax Policy Center estimates that only about 0.2 percent of estates pay any federal tax.

The House’s tax plan is not final. The Senate will introduce its own plan and the two bills, if passed, must be reconciled.